Electric furnace



Gil

, 'trede will be properly positioned so es run over pulleys le and ereprovided ,h Weights l5. The pulleys il are iounted in n. yoke l@ whichis secured by bolt il to 'the top of the transformer core. The entireconstrui'ztioi'i may be conven iily supported directly on the furnace o,es by s, bracket 19' bolted to the under i, of the ,trarne 2O whichCurries tl e transformer core end the primary coil.

will be understood that when the for nace is charged the electrode isreisen, so that the secondary coil is at or neer the tog of thetransformer core. The line. current is new turned on the primary coil.The electrode 'is then allowed to descend until it touches the charge inthe urnoice, et which time current begins to low in the secondsry coil.lihen the current starts to flow in the secondary coil, this coil isrepelled und moves sway from the primary coil. rlhis inoxf'ement willcontinue until the force et' the repulsive action between the coils isbalanced by the weight of the electrode und the parts connecting; itwith the secondary coil, at which time 'the elec es to delive current tothe charge at u rote which will effectively melt the charge.

l1" desired, certain auxilieiyfdevice e employed to assist inconl'iollin movement of and in positioii f The elccs muy g the trede.lvliile these auxiliary ees when elnployff'l may be rn'ried'inconstruction, e pair oil flinders 2l, 22 is provided these cylinderbeing carried on the freine lil be 'fore referred to The bottoms of' theey'irf ders y., ere in open communication with the nir es shown,

Ene pipe is led from the top of the cylinder 2l. and. similar pipe 29 isled 'troni the top ezt the lcylinder 22, these pipes brzincl ing from spipe :3. llistons 524-, 25 wor in these cylinders, these pistons beingmounted on the rods 26, 27 which, es bcfore described, ere secured tothe yoke 10.

' lLe pipe 23 loads to s 'vulve chamber oO.

This ebenber 30 has en nir inlet -pipe 3l which is consrolled by e,valve ln 'what ere regarded es 'the best con- Y.ifi

sti ieri ns embodying the invenfinion1 this valve 52 Wlll beelectrically operated. is

sh n, its stem forms the core ci :i soleno This solenoid 3l 1s connectedto s eender-y coil 6 by :1. Wire and is connected to the charge by s.wire 36. `Wih no current en the furnace the Y lie B2 will be normallyheld closed by its own weight n ffi 'iw fi E T if.' 1'.: .tg my) ,.Tysus. oy et colgo oL isses cin oo, linen, neuerer, 'the elect 'or 'a inuppermost position and incre current on the 'furnoce, the potentie-l thecoil 6 will. cause ,fr .1. e .Ln .ci sunicien-u current ie on' througnithe solenoid to it to cken the valve. lchirng the tune, therefrom, Weenthe electrode is descendinft sir Will be lowing into the cyl ifs/meseinders 2l, 22, through the inlet pipes Q Q,

of' 'the pistons. llhen the ,ectredr touches liroufrli the 'the charge,the current lie/wing solenoid will be shui'ite( und vulve will close Atthis time, therefore, 'there will be e' partiel Vscunin in the cylindersabove the pistons. When Jfor :my reason the current in the secondaryincreases, .so that the electrode is delivering too muc-l current to thefurnace, the repulsive action between the coils 5 end 6 will increase,thus causing the electrode to -rnove sway from the charge. it is desiable that this more nient be nninipeded, so tl'izit it may take placequickly. rllhe nir cylinder arrange ment before described facilitatesthis Inoveinent, due to the 'fact that the air pressure above thepistons is less than the atmospheric pressure below the pistons so thatthe pistons here a, slight tendency to lift the electrode sind the partsconnected therewith. fis soon, however, es the electrode hes moved swayfrom the charge, eurrenil is reesteblished in the circuit in thesolenoid and the mlVe'B/Z is opened. The pressure above the pistons,therefore, rapidly becomes atmospheric pressure, and the pistons' CFI itwill be understood that the parts will so designed that the properrelation eziists between the repulsive oction derfvjloped between thecoils 5, 6 :ind the. weight of the electrode ond the parts connectedtherewith, so that, :it the time the repulsive action is balanced by heWeight, the electrode will be in proper position lo deliver currentotothe furnace et a, proper rute.

lilhile the invention hss been so 'tur described in connection with ssingle elecu trede, the construction is adapted for use in e furnacelowing more than one electrode, endl;particularly in o. three-phsseturnece. The connections which n'iey be ein ployed 1when the inventionis embodied in three-phase furnace are indicated in Fig.

in this figure, the cores of' the transformers are indicated at Li0 sindthe primary coils et il These coils nre connected to the. line throughthe usuel three-phase delley tion. The secondary coils sire inerlied :ieleads from these coils to the electi es being .indicated at The commonconnection between the coils is indicated et fue.. the electrodes :ireAshown at 45, and

the charge in the furnace is indicated atbe appli-d t c eh ofthe threeelectrodes.

L rTeme, Seid "'eneformer her/ir;

The auxiiiery controiino' mee'heiiee hereinbefore described ispertieu'ery Yentfigeous in connection with e threephase furnace,beeeiise the deeending movemerr of emi-h electrode will be stopped essoon as the eieetrode oilches the charge we 'o @Ehe Siiuiiing of theVeve controiingg eolieiiok s. The digging of any electrode into 'diecharge is, therefore, preveried and e. :more equal iivieion of thecurrent between the eeebrodes is effected. w

Changes mici verietions may mede the eonstrue'fion described emiiiiustrelbe' without departing from the inren'eion herein claimed.

l. In en eeerio furnace, the Combination with :in eiecbrocie, of meansfor sugpying current to the electrode ine-hiding moreel element, andmeans or utiizirig ehe movemen of seid element to Control the positionof the eeet'rocfle with respect io tire charge.

2. )n an electric furnace, the eemsine'on with en eieorofie, ofisreesiormer for plyingeurrent to the eleerod'e, am?. rn for utilizingthe rensiormer io eoiir p'osision 01 'the/electrode 'with the charge.

3. n en eeotrie furnace, ehe with. electrode, of eeraiisormer o herringe movable eemezib, e f @echoes bete/'eee` the movable eeme 'theerectrode whereby `the movemen of seid he electrode Wih respect totheveherge.

n :m electric furnace, time eembineion wesh means 'for aieivering;eurreneo Sire charge in the furnace, o e zrensormer F ing e. movable.eiemeii, end ineens for i, izingg; the moveiien/y of moveoie eiement teeoiro lie current eik/ered sto "he charge. Y

1.13 I hveriiig eurren! 'to ehe merge 1n eemena, of means for uti K,ment of seid. eil-ement eo Control devered o t? elierge.

In an .eiee rie urneoe, Por wieii en. eeerode, of e currening e primaryeurreri, e eurre e. 'secondary current is induced b mary current, andmeans fer-uiiizieg repuisive oree develope@ beiiweei be ear riers by thecurrent ow thereiri to eontro he position ofthe electrode wiih respee tothe Acharge of ihe furnace.

7. l'n an eleerie furnace, the combination with an electrode of e coilcarrying e primary eurreni, a ooi in which e seeoodery current isinduced by 'the primary and for uilizing the repiiifii 'eveoped betweendie coils to eoetrol posiien of fiile @iwi iie chez-ge of the fur e 8.in in eeci'i'ie furnace, 'ehe comme. with :in eeerode, or e erenelformermeans for utilizing lire repiiisire force Y@ Teioped between 'dieprimary and secom. i elemente oi 'iie immer ,mier io eenirol Lifepoei'nioii of iie electrode 'with respect ie iie charge.

and a, movebe ewrom-carrying mem connections ei/'hereby ihe more iiieo';of eiie movable eemerit eoiiroe ele-eree resfeee ,J "io the eeer arie, nof die moy. "che eee- ,to le Neer l e i ce, the combine ioni wih eneectroeie, of erens'former, and for uilizing repueive 33"?? deveopefbetween the' primary :1516; eeeorefi ery of the ixrensfermerfor posi f"he eieebroe with respect 'tov he auxiliary positioning mesme,

i zee eieeirlo urneee, the eoreoim eieeroe, of e 4tr@nsoriirer ieCurrent-cerryiig; f elecommozione whereby variation in tesieeu themerakie eiemenr, pesir'oos the Aeeetrecie Wii'sh respect io he ciau,...13, and, er iiiiery posii'gioiiii means. U I e eeetrio furnace., theeoiribiiia- Heee, of e. treesormer .i ent-Cerf eleoie .em-ent positionsehe eleoi'espee; 'Le the oiierge, eed. mixmeens. V

iiiery i5. lfm en eeei ie iurrieee, the oombinzimy 'ioig with eetrode,of a transforme-r, one of ''loe currenw-.erryng elements of j/vh'oh ismovable, ineens for connecting the newbie element o 1the electrode,

whereby Vereiom. iri pesizifoii ofthe mov- 335 bie eombiiiw 'reformer eim 'e furnace3 the eoinhinfiy of a transformer :L eiirrent-eerringelement of which is\in vble, ineens for supporting the tzinsioriner thefurnace, Connections wherein7 the movable element of the transformerpogitions the electrode with respeet to the eherge, entiauxilieryiiositioning means.

i8. in a three-phz1se eleetrie Yl`iirnziee, the eembinetion with theeieotrocles, of e transformer unit tor each electrode, eeeh ot sindunits he iop; :i movable e'urrent-em'rying element, means for supportingthe trans- ?ii former units on the furnace, and eonneetiene hetween eachelect-rode and the mov- 'eble element of its transformer uniey wherer.movements of the elements position .o eieetroes. Kr. le threephiiseeleetrie furnace, the liinetion with the electrodes, ot tren@- unit foreach electrode, ezieii et sont units having e movable current-ezirryinggelenrient7 ineens for stipportininr the transn fo er units on thefurnace, connections between eichl electrode :incl the movable elementits transformer nuit, whereby the movements of the elements position theelectrodes, and fmziiliary i'iositioning means.

in :in electric furnace, the combimtion with en electrode, of :ttransformer having zi, movable enrrent-ezirrying element, and rigidconnections between seid element and the electrode, whereby theelen'ient intl the electrode move together :uid the eieetrede isproperly positioned with respect to the charge.

2l. lin in elertrie furnace, Jdie eoinbinw tion with zin electrode, ofit transformer havingY a movable current-carrying element, rigid connetions between Suid element und the electrode, whereby the element :intlthe electrode move together and the electrode is properly positioned'with respect to the charge, and auxiliary positioning devices.

ln testimony whereof, I have hereunto set my hand.

MORRIS BENNET'L

